Machine for tacking shoe-shanks.



No.'884,437. PATENTED APR. 14, 1908. B. B. WATBRMAN. MACHINE FOR TAOKING SHOE SHANKS.

APPLICATION FILED SEPT. 26, 1907,

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PATENTED APR. 14, 1908.- B. B. WATERMA-N. I MACHINE FOR TAGKING SHOE SHANKS.

APPLICATION FILED 153F126. 1907.

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No; 884,437. PATENTED'IAPIR. 14, 1908;

K B. B'. WATBRMAN. MACHINE FOR TAOKING SHOE SHANKS.

APPLICATION FILED SEPT.26. 1907.

8 SHEETS-SHEET 3.

witnesses- Inventar i v a (1 HE NORRIS PETERS co, wasnmcrrau, u. c,

PATENTED APR. 14, 1908. B. B. WATBRMANP MACHINE FOR TAGKING SHOE SHANKSf APPLICATION FILED SEPIHZB, 1907.

8 SHEETSSHEET 4.

witnesses No. 884,437. PATENTED APR. 14',- 1908.

B.,B. WATERMAN.

MACHINE FOR TAGKING SHOE SHA'NKS.

APPLICATION FILED SBPT.26.1907

8 SHEETS-SHEET 5. V

witnesses I Mentor rus "clams PETERS co WASHINGTON, n4 cv PATENTED APR. 14, 1908. B. B. WATER-MAN. MACHINE FOR TAGKING SHOE SHANKS.

APPLICATION FILED SEPT.26. 1907.

8 SHEETS-SHEET 6.

No. 884,437. PATENTED APR. 14, 1908.-

' B. B. WATERMAN.

MACHINE FOR -TAGKING. SHOE sHANKs.

APPLICATION FILED SEPT. 26.1907.

' 8 SHEETS-SHEET 7.

. witnesses m5 mamas PETERs co., wnsmzvcrau, n. c

No. 884,437. PATENTED APR. 14, 1908.

B. B. WATERMAN.

MACHINE FOR TAGKING SHOE SHANKS.

IAPPLIOATION FILED snmze. 1907.

a SHEETS-SHEET a.

UNITED STATES PATENT OFFICE.

BRADFORD B. WATERMAN, OF EAST BRIDGEWATER, MASSACHUSETTS, ASSIGNOR TO THE AMERICAN SHOE FINDING COMPANY, A CORPORATION OF MAINE.

Application filed September 26, 1907.

To all whom it may concern:

Be it known that I, BRADFORD B. WATER- MAN, a citizen of the United States, residing at East Bridgewater, in the county of Plymouth and State of Massachusetts, have invented new and useful Improvements in Machines for Tacking Shoe-Shanks, (Case A,) of which the following is a specification.

This invention relates to improvementsin machines for fastening two pieces of material together by means of a tack or tacks or the like, and particularly to machines for tacking metallic stiifeners to leather board shoe shanks, and the object is to provide means whereby if one of the stiffeners fails to receive one or more tacks which it should receive the leather board shank already intro-. duced by the operator is moved out of operative relation with the driving instrumentalities and thereafter until the next cycle of operations of the machine begins the operator is prevented from introducing the leather board shank into operative relation with the driving instrumentalities.

While the present embodiment can be used in connection with various styles of machines for tacking stifleners to shoe shanks, I have chosen to illustrate it as applied to a machine substantially like that shown and described in United States Letters Patent granted to me February 1, 1907, No. 842,984, to which reference may be had for details of construction and operation and, therefore, a general description of much of said machine will be sufficient. In the machine of said Letters Patent if one of the metallic stiffeners failed to receive a tack or tacks it was automatically ejected by a suitable mechanism, while in the present invention said mechanism is omitted and gives place to the means hereinbefore referred to for moving the leather board shank out of operative relation with the driving instrumentalities and thereafter until the next cycle of operations begins the operator is prevented from introducing the leather board shank.

The invention consists in the combination and arrangement of parts set forth in the following specification and particularly pointed out in the appended claims.

Referring to the drawings: Figure 1 isa longitudinal sectional elevation of a machine embodying my invention. Fig. 2 is an elevation of the same viewed from the right of Fig. 1. Fig. 3 is an enlarged detail elevation Specification of Letters Patent.

Patented April 14, 1908.

Serial No. 394,686.

viewed from the left of Fig. 1. Fig. 4 is an enlarged detail longitudinal sectional elevation of the left hand end of the machine. Fig. 5 is a detail lan section taken on line 5-5 of Fig. 4. ig. 6 is a sectional elevation taken on line 66 of Fig. 4, looking toward the right. Figs. 7, 8 and 9 are illustrative diagrammatic views showing the combined ejecting and guard mechanism in different positions, Fig. 7 showing the ejector in the position which it occupies immediately after theleatherboard shankhas been ejected, Fig. 8 showing the ejector in its raised position after the beginning of its dwell and as the lever begins to trip, and Fig. 9 showing the guard at the end of its dwell, the lever having been tri ped. In Figs. 10 to 15, inclusive, a modified form of my invention is shown, in which :Fi 10 is an enlarged detail longitudinal sectional elevation of the left hand end of the machine. Fig. 11 is a plan section taken on line 11-11 of Fig. 10. Fig. 12 is a section taken on line 1212 of Fig. 10 looking toward the right. Figs. 13, 14 and 15 are illustrative diagrammatic views showing the ejecting and guard mechanism in different positions corresponding to the ositions shown in Figs. 7, 8 and 9. In

igs. 16 to 20, inclusive, I have shown a second modified form of my invention, in which Fig. 16 is an enlarged detail longitudinal elevation of the left hand end of the machine. Fig. 17 is a plan section taken on line 1717 of Fig. 16. Fig. 18 is a section taken on line 18 18 of Fig. 16, looking toward the right. Figs. 19 and 20 are illustrative diagrammatic views showing the ejecting mechanism in different positions, Fig. 19 showing the ejector in its advanced position and the lever at the moment of tripping, and Fig. 20 showing the lever entirely tripped in position to allow the spring to return the parts to their normal positions.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings, referring to Figs. 1 to 9, inclusive, 30 is the frame of the machine consisting of two side members on which is supported a raceway 31 in which a plurality of the stifieners 32 are located. A feeding mechanism 33 feeds the stiffeners 32 one by one a portion of their width from the bottom of the pile of stiffeners located in the raceway 31, said stiffeners moving therefrom along the horizontal raceway consisting of two 1 it is desirable that the shank 42 shall not be and is connected at its other guides 34,34. Asecond feeding mechanism 1 35 com rises a feed bar 36 on which are mounted feed pawls 37, 38 and 39 which are so arranged as to feed a continuous row of the stiffeners beneath raceways 40 and separate said stiffeners from said row and feed them one by one beneath two anvils 41, 41. One of the leather board shanks 42 is shown resting on a vertically reciprocatory driver 43 which is actuated by a driver mechanism 44. Each of the stiffeners 32 is provided with two erforations 45, 45 in which should be located tacks 46, 46, respectively, said tacks being placed therein by the tack placing means which in this instance consists of the raceways 40. In case one of thesti'ffeners should fail to receive either of its tacks tacked thereto and to that end two ejectors 47 which constitute also guards which eject the leather board shank if already introduced by the operator and thereafter until the next cycle of operations of the machine begins prevent the o erator from introducing the leather boar shank into operative relation with the driving-instrunientalities.

In the embodiment of my invention shown in Figs. 1 to 9, inclusive, the ejectors 47 are slidably mounted in a guide plate 48 fast to the frame 30 of the machine and are actuated by the following mechanisms. Two slides 49, 49 which are mounted to slide in ways 50, 50 in the guides 34, 34, respectively, are provided with cars 51, 51, respectively, in which the ejectors 47, 47 are slidably arranged. The ejectors 47, 47 are provided, respectively, with transversely bent portions 52, 52 which when said ejectors are moved toward the left, Figs. 4 and 5, strike the guide plate 48 and are thus limited in their movement. Two helical compression springs 53, 53 surrounding the ejectors 47, 47, respectively, bear at one pair of ends against the transverse portions 52, 52 and at their other pair of ends against the ears 51, 51. On the slides 49, 49, respectively, are pivotally mounted levers 54, 54, said levers being provided, respectively, with projections 55, 55 which are normally located in the paths of movement of the points of the tacks 46, 46, respectively, each of said levers being provided with a cam surface 56. Each of the slides 49 is normally drawn toward the right by a spring 57 which is connected at one end to a pin 58 which constitutes the pivot of the lever 54 end to a pin 59 fast to the guide 34. The slides 49 are lim ited in their movement toward the right by the metal of the guides 34 at the termination of the ways 50. The feed slide 36 is provided with a downwardly extending T-shaped projection 60 comprising two transverse arms 61, 61 which are adapted to engage the right hand ends of the levers 54, 54, respectively,

said ends being located in the paths of movement of said arms, respectively, when there are no tacks in contact with the projections 55, 55. When the slides 49, 49 are moved toward the left, as hereinafter described, the cam surfaces 56, 56 engage wipers 62, 62, respectively, each of which consists of a screw passing through a slot 63 formed in one of the guides 34, there being a nut 64 having screwthreaded engagement with said screw and located in a groove 65, whereby said screws may be adjusted toward the right or left, Fig. 4, as may be desired.

The general operation of the machine is as follows: As the stiffeners 32 are fed toward the driving means which consists of the anvils 41 and drivers 43, if one of the stiffeners has two tacks located in its perforations, said tacks engage the inclined projections 55, 55, respectively, and as the stiffener is fed along said tacks rock the levers 54 on their pivots 58 and thus the right hand ends of said levers are moved upwardly out of the paths of movement of the arms 6], respectively, and as the feeding movement continues until said stiffener has arrived in operative relation with the driving means, theejecto'rs 47 and their actuating mechanisms remain inactive in the position shown in full lines in Fig. 4. The operator, is, therefore, permitted to introduce the shank 42 into 0 erative relation with the driving means, t at is, onto the driver 43 and the tacks 46 are driven through said shank. If, however, either of the perforations 45 should fail to receive a tack the lever 54 over which said perforation passes remains'in its normal position, as shown in Fig. 7, with its right hand end in the path of movement of the arm 61 and as the feed slide 36 moves toward the left, said arm strikes said end of said lever and the slide 49 is moved thereby toward the left in unison with the feed slide 36 thereby acting through the spring 53 to move the ejector 47 toward the left and knock the leather board shank 42 off of the driver 43. The transverse portion 52 of the ejector 47 strikes the guide plate 48 which limits the movement of said ejector toward the left and as the movement of the slide 49 continues toward theleft the spring 53 is compressed, as shown in Figs. 8 and 9. The cam surface 56 strikes the wiper 62 and as the movement of the slide 49 continues toward the left, said wiper rocks the lever 54 on its pivot 58 until the right hand end of said lever is moved out of engagement with the arm 61, thus tripping the lever whereupon the spring 57 acts to return the slide 49, the ejector 47 and lever 54 to their normal positions. If it were not for the tripping of the levers 54 as just described the movement of 36 toward the left would carry the left hand ends of said levers between the anvils 41 and the drivers 43 with the result that said drivers in approaching said anvils would be apt to cause the shoe shank 42 to strike said levers.

the feed bar It will be seen that during the time that the spring 53 is under compression the ejector 47 dwells in position to prevent the operator from introducing the leather board shank 42 until the next cycle of operations of the machine begins.

Referring now to Figs. 10 to 15, inclusive, in which a modified form of my invention is shown, 47, 47 are ejectors which are pivoted at 48 to the frame 30 of the machine and is actuated by the following mechanism. Two slides 49, 49 which are mounted to slide in Ways 50, 50 in the guides 34, 34 respectively, are provided with arms 51, 51, respectively, to which links 52, 52 are pivotally connected, said links having two arms 53, 53 which are individually connected to the arms 51, respectively. The links 52 are provided with slots 54 in which blocks 55 are arranged to slide, said blocks being pivotally connected to the ejectors 47. Rods 56 fast to the blocks 55 and arranged to slide in holes 57 in the links 52 are surrounded by helical compression springs 58 each of which bears at one end against said block and at the other end against said link, said springs being adapted to normally maintain said blocks at the left hand ends of the slots 54. The ejectors 47 are provided with arms 59 adapted to engage a rod 60 fast to the frame 30 of the machine, whereby movement of the ejectors 47 is limited in one direction. On the slides 49, 49, respectively, are pivotally mounted levers 61, 61, said levers being provided, respectively, with projections 62, 62 which are normally located in the paths of movement of the points of the tacks 46, 46, respectively, each of said levers being provided With a cam surface 63. Each of the slides 49 is normally drawn toward the right by a spring 64 which is connected at one end to a pin 65 constituting the pivot of the lever 61 and is connected at its other end to a pin 66 fast to the guide 34. The slides 49 are limited in their movement toward the right by the metal of the guides 34 at the termination of the ways 50, 50, The feed slide 36 is provided with a downwardly extending T-shaped projection 67 comprising two transverse arms 68, 68 which are adapted to engage the right hand ends of the levers 61, 61, respectively, said ends being normally located in the paths of movement of said arms, respectively. When the slides 49, 49 are moved toward the left, as hereinafter described, the cam surfaces 63, 63 engage wipers 69, 69, respectively, each of which consists of a screw passing through a slot 7 0 formed in one of the guides 34, there being a nut 71 having screwthreaded engagement with said screw and located in a groove 72, whereby said screws may be adjusted toward the right or left,

Fig. 4, as may be desired.

The general operation of the modified form of my invention just described is as follows: As the stiffeners 32 are fed toward the driving means which consists of the anvils 41 and driver 43, if one of the stiffeners has two tacks located in its perforations, said tacks engage the inclined projections 62, 62 and as the stiffener is fed along said tacks rock the levers 61 on their pivots 65 and thus the right hand ends of said levers are moved upwardly out of the paths of movement of the arms 68, respectively, and as the feeding movement continues until said stiffener has arrived in operative relation with the driving means the e ector 47 and its actuating mechanism remains inactive in the position shown in Fig. 10. The operator is, therefore, permitted to introduce the shank 42 into operative relation with the driving means, that is, onto the driver 43 and the tacks 46 are driven through said shank. If, however, either of the perforations 45 should fail to receive a tack the lever 61 over which said perforation passes remains in its normal position as shown in Fig. 13 with its right hand end in the path of movement of the arm 68 and as the feed slide 36 moves toward the left said projection strikes said end of said lever and the slide 49 is thereby moved toward the left in unison with the feed slide 36, thereby acting through the link 52, spring 58, and block 55 to rock the ejector 47 into the position shown in Fig. 13. As the arm 59 strikes the rod 60 the rocking movement of the ejector 47 is stopped and as the movement of the link 52 continues the spring 58 is compressed, as shown in Figs. 14 and 15. The cam surface 63 strikes the wiper 69, as shown in Fig. 14, and as the movement of the slide 49 toward the left continues the right hand end of the lever 61 is moved out of engagement with the arm 68, that is, said lever is tripped, as shown in Fig. 15, and the spring 64 acts to return the parts to their normal position, as shown in Fig. 10. It will be seen that during the period of time that the spring 58 is under com pression the ejector 47 will remain in the position shown in Figs. 14 and 15 and will prevent the introduction of the leather board shank 42 until the next cycle of operations of the machine begins.

Referring now to Figs. 16 to 20, inclusive, in which a second modified form of my invention is shown, it will be seen that this mechanism is in all respects identical with the mechanism first described and shown in Figs. 1 to 9, inclusive, except that the springs 53 are omitted and the ejectors 47 are rigidly connected to the slides 49 respectively, and, therefore, said ejectors do not dwell at the left hand end of their movement as in the form shown in Figs. 1 to 9, inclusive. In all other respects, however, the construction and operation is similar to the form of my invention first described and a detailed description will be unnecessary. It will be evident that the ejector and guard mechanisms may be embodied in various other forms and may be applied to machines other than the machine in connection with which I have illustrated them and I do not limit myself to the embodiment herein shown.

Having thus described my invention, what I claim and desire by Letters Patent to secure is:

1. In a machine for fastening two pieces of material together by means of a tack or the like, means for introducing a tack into one piece, means for driving said tack into a second piece, and means to move said second piece out of operative relation with said driving means when said first piece fails to receive a tack.

2. In a machine for fastening two pieces of material together by means of tacks or the like, means for introducing two tacks into one piece, means for driving said tacks into a second piece, and means to move said second piece out of operative relation with said driving means when said first piece fails to receive two tacks.

3. In a machine for fastening two pieces of material together by means of a tack or the like, means for introducing a tack into one piece, means for driving said tack into a second piece, and means to move said second piece out of operative relation with said driving means when said first piece fails to receive a tack, said last-named means being adapted todwell for a period of time in position to prevent the introduction of said second piece into operative relation with said driving means.

4. In a machine for fastening two pieces of material together by means of tacks or the like, means for introducing two tacks into one piece, means for driving said tacks into a second piece, and means to move said second piece out of operative relation with said driving means when said first piece fails to receive two tacks, said last-named means being adapted to dwell for a period of time in position to prevent the introduction of said second piece into operative relation with said driving means.

5. In a machine for fastening two pieces of material together by means of a tack or the like, means for introducing a tack into one piece, means for driving said tack into a second piece, means for feeding said first piece from said tack introducing means toward said driving means, and means to move said second piece out of operative relation with said driving means, said last-named means being adapted to be actuated by said tack to be rendered inactive as to the moving of said second piece.

6. In a machine for fastening two pieces of material together by means of tacks or the like, means for introducing two tacks into one piece, means for driving said tacks into a second piece, means for feeding said first piece from said tack introducing means toward said driving means, and means to move said second piece out of operative relation with said driving means, said last-named means being adapted to be actuated by both of said tacks to be rendered inactive as to the moving of said second piece.

7. In a machine for fastening two pieces of material together by means of a tack or the like, means for introducing a tack into one piece, means for driving said tack into a second piece, means for feeding said first piece from said tack introducing means toward said driving means, and means to move said second piece out of operative relation with said driving means, said last-named means being adapted to be actuated by said tack to be rendered inactive as to the moving of said second piece, said last-named means being adapted to dwell for a period of time in position to prevent the introduction of said second piece into operative relation with said driving means.

8. In a machine for fastening two pieces of material together by means of tacks or the like, means for introducing two tacks into one piece, means for driving said tacks into a second piece, means for feeding said first piece from said tack introducing means toward said driving means, and means to move said second piece out of operative relation with said driving means, said last-named means being adapted to be actuated by both of said tacks to be rendered inactive as to the moving of said second piece, said last-named means being adapted to dwell for a period of time in position to prevent the introduction of said second piece into operative relation with said driving means.

9. In a machine for fastening two pieces of material together by means of a tack or the like, means for introducing a tack into one piece, means for driving said tack into a second piece, a raceway, means for feeding said first piece along said raceway from said tack introducing means toward said driving means, and means to move said second piece out of operative relation with said driving means when said first piece fails to receive a tack.

10. In a machine for fastening'two pieces of material together by means of tacks or the like, means for introducing two tacks into one piece, means for driving said tacks into a second piece, a raceway, means for feeding I said first piece from said tack introducing means along said raceway toward said driving means, and means to move said second piece out of operative relation with said driving means when said first piece fails to receive two tacks.

11. In a machine for fastening two pieces of material together by means of a tack or the like, means for introducing a tack into one piece, an anvil, a driver movable toward and away from said anvil, means for feeding said first piece between said anvil and said driver, and means to move a second piece out of operative relation with said anvil and said driver when said first piece fails to receive a tack.

12. In a machine for fastening two pieces of material together by means of tacks or the like, means for introducing two tacks into one piece, an anvil, a driver movabletoward and away from said anvil, means for feeding said first piece between said anvil and said driver, and means to move a second piece out of operative relation with said anvil and said driver when said first piece fails to receive two tacks.

13. In a machine for fastening two pieces of material together by means of a tack or the like, means for introducing a tack into one piece, means for driving said tack into a second piece, a device adapted to move said second piece out of operative relation with said driving means, means for feeding said first piece from said tack introducing means toward said driving means, a movable member normally located in the path of movement of said tack, and means operatively connecting said member to said device, whereby when said first piece fails to receive a tack, said device moves said second piece out of operative relation with said driving means.

14. In a machine for fastening two pieces of material together by means of tacks or the like, means for introducing two tacks into one piece, means fordriving said tacks into a second piece, a device adapted to move said second piece out of operative relation with said driving means, means for feeding said first piece from said tack introducing means toward said driving means, two movable members normally located in the paths of movement of said tacks, respectively, and means operatively connecting said members, whereby when said first piece fails to receive two tacks said device moves said second piece out of operative relation with said driving means.

15. In a machine for fastening two pieces of material together bymeans of a tack or the like, means for introducing a tack into one piece, means for driving said tack into a second piece, a device adapted to move said second piece out of operative relation with said driving means, means for feeding said first piece from said tack introducing means toward said driving means, a lever, one end of which is normally located in the path of movement of said tack, the'other end of said lever being normally located in the path of movement of a portion of said feeding means, and means operatively connecting said lever to said device, whereby when said first piece fails to receive a tack, said device moves said second piece out of operative relation with said driving means.

16. In a machine for fastening two pieces of material together by means of a tack or the like, means for introducing a tack into one piece, means for driving said tack into a second piece, a device adapted to move said second piece out of operative relation with said driving means, means for feeding said first piece from said tack introducing means toward said driving means, a lever, one end of which is normally located in the path of movement of said tack, the other end of said lever being normally located in the path of movement of a portion of said feeding means, and means operatively connecting said lever to said device, whereby when said first piece fails to receive a tack, said device moves said second piece out of operative relation with said driving means, said device being adapted to dwell for a period of time in position to prevent the introduction of said second piece into operative relation with said driving means.

17. In a machine for fastening two pieces of material together by means of tacks or the like, means for introducing two tacks into one piece, means for driving said tacks into a second piece, a device adapted to move said second piece out of operative relation with said driving means, means for feeding said first piece from said tack introducing means toward said driving means, a lever, one end of which is normally located in the path of movement of one of said tacks, a second lever, one end of which is normally located in the path of movement of the other of said tacks, the other pair of ends 'of said levers being normally located in the path of movement of a portion of said feeding means, and means operatively connecting said levers to said device, whereby when said first piece fails to receive two tacks, said device moves said second piece out of operative relation with said driving means.

18. In a machine for fastening two pieces of material together by means of tacks or the like, means for introducing two tacks into one piece, means for driving said tacks into. a second piece, a device adapted to move said second piece out of operative relation with said driving means, means for feeding said first piece from said tack introducing means toward said driving means, a lever, one end of which isv normally located in the path of movement of one of said tacks, a second lever, one end of which is normally located in the path of movement of the other of said tacks, the other pair of ends of said levers being normally located in the path of movement of a portion of said feeding means, and means operatively connecting said levers to said device, whereby when said first piece fails to receive two tacks, said device moves said second piece out of operative relation with said driving means, said device being adapted to dwell for a period of time in position to prevent the introduction of said second piece into operative relation with said driving means.

19. In a machine for fastening two pieces of material together by means of a tack or the like, means for introducing a tack into one piece, means for driving said tack into a second piece, a device adapted to move said second piece out of operative relation with said driving means, a feeding device adapted to feed said first piece from said tack introducing means toward said driving means, a member movable toward and away from said driving means, a lever pivoted on said member, one end of said lever normally located in the path of movement of said tack, the other end of said lever normally located in the path of movement of said feeding device, and means operatively connecting said member to said first-named device, whereby when said first piece fails to receive a tack, said first-named device moves said second piece out of operative relation with said driving means, said last-named means comprising a spring arranged to permit said first-named device'to dwell for a period of time in position to prevent the introduction of said second piece.

20. In a machine for fastening two pieces of material together by means of tacks or the like, means for introducing two tacks into one piece, means for driving said tacks into a second piece, a device adapted to move said second piece out of operative relation with said driving means, a feeding device adapted to feed said first piece from said tack introducing means toward said driving means, a member movable toward .and away from said driving means, a lever pivoted on said member, one end of said lever normally located in the path of movement of one of said tacks, a second member movable toward and away from said driving means, a second lever pivoted on said second member, one end of said second lever normally located in the path of movement of the other of said tacks, the other pair of ends of said levers normally located in the path of movement of said feeding device, andmeans o eratively connecting said members to sai first-named device, whereby when said first piece fails to receive two tacks, said first-named device moves said second piece out of operative relation with said drivlng means, said last-named means comprising a spring arranged to permit said secondnamed device to dwell for a period of time in position to prevent the introduction of said second piece.

21. In a machine for fastening two pieces of material together by means of a tack or the like, means for introducing a tack into one piece, means for driving a tack into a adapted to feed said first piece from said tack introducing means toward said driving means, a member movable toward and away from said driving means, a lever pivoted on said member, one end of said lever being normally located in the path of movement of said tack, the other end of said lever being normally located in the path of movement of said feeding device, means operatively connecting said member to said first-named device, whereby when said first piece fails to receive a tack, said feeding device engages said lever and. actuates said first-named device to move said second piece out of operative relation with said driving means, and means to disengage said lever from said feeding device'during its feeding movement.

22. In a machine for fastening two pieces of material together by means of tacks or the like, means for introducing two tacks into one piece, means for driving said tacks into a second piece, a device adapted to move said second piece out of operative relation with said driving means, a feeding device adapted to feed said first piece from said tack introducing means toward said driving means, two members movable toward and away from said driving means, twolevers pivoted on said members, res ectively, two ends of said levers normally ocated in the paths of movement of said tacks, respectively, the other pair of ends of said levers being normally located in the path of movement of said feeding device, means operatively connecting said members to said firstnamed device, whereby when said first piece fails to receive two tacks, said feeding device engages said levers and actuates said firstnamed device to move said second piece out of operative relation with said driving means, and means to disengage said levers from said feeding device during its feeding movement. Y

23. In a machine for fastening two pieces of material together by means of a tack or the like, means for introducing a tack into one piece, means for driving said tack into a second piece, a device adapted to move said second piece out of operative relation with said driving means, a feeding device adapt: ed to feed said first piece from said tack introducing means toward said driving means, a member movable toward and away from said driving means, a lever pivoted on'said member, one end of said lever being normally located in the path of movement of said tack, the other end of said lever being normally located in the path of movement of said feeding device, means operatively connecting said member to said first-named device, whereby when said first means, and means to disengage said lever from said feeding device during its feeding movement, said last-named means being adjustable toward and away from said drivmg means.

24. In a machine for fastening two pieces of material together by means of tacks or the like, means for introducing two tacks into one piece, means for driving said tacks into a second piece, a device adapted to move said second piece out of operative relation with said driving means, a feeding device adapted to feed said first piece from said tack introducing means toward said driving means, two members movable toward and away from said driving, means, two levers pivoted on said members, respectively, two ends of said lever being normally located in the paths of movement of said tacks, respectively, the other air of ends of said levers being normally ocated in the path of movement of said feeding device, means operatively connecting said members to said first-named device, whereby when said first piece fails to receive two tacks, said feeding device engages-said levers and actuates said first-named device to move said second piece out of operative relation with said driving means, and means to disengage said levers from said feeding device during its feeding movement, said last named means being adjustable toward and away from said driving means.

25. In a machine for fastening two pieces of material together by means of a tack or the like, means for introducing a tack into one piece, means for driving said tack into a second piece, a device adapted to move said second piece out of operative relation with said driving means, a feeding device adapted to feed said first piece from said tack introducing means toward said driving means, a slide movable toward and away from said driving means, said slide being operatively connected to said first-named device, a lever pivoted on said slide, one end of said lever being normally located in the path of movement of said tack, the other end of said lever being normally located in the path of movement of said feeding device, and a sprin interposed between said slide and said firstnamed device, whereby said first-named device is adapted to dwell for a period of time in position to prevent the introduction of said second piece.

26. In a machine for fastening two pieces of material together by means of a tack or the like, means for introducing a tack into one piece, means for driving said tack into a second piece, a feeding device adapted to feed said first piece from said tack introducing means toward said driving means, a slide adapted to move said second piece out of operative relation with said driving means, a second slide movable toward and away from said driving means, said second slide being operatively connected to said first slide, a lever pivoted on said second slide, one end of said lever normally located in the path of movement of said tack, the other end of said lever normally located in the path of movement of said feeding device, and a spring interposed between said first and second slides, whereby said first slide is adapted to dwell for a period of time in position to prevent the introduction of said second piece into operative relation with said driving means.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

BRADFORD B. WATERMAN. Witnesses CHARLES S. GooniNe, ANNIE J. DAILEY 

